<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Beijing Bus - ECHARTS-GL</title>
        <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
        <meta name="apple-mobile-web-app-capable" content="yes"> <!-- Fullscreen Landscape on iOS -->
        <link rel="stylesheet" href="./common.css">
    </head>
    <body>
        <div id="main"></div>
        <script src="../node_modules/echarts/dist/echarts.js"></script>
        <script src="../node_modules/echarts/map/js/province/beijing.js"></script>
        <script src="../node_modules/echarts/theme/dark.js"></script>
        <script src="../dist/echarts-gl.js"></script>
        <script src="lib/jquery.min.js"></script>
        <script src="js/commonUI.js"></script>
        <script>
            var chart = echarts.init(document.getElementById('main'));

            $.getJSON('data/lines-bus.json', function (data) {
                var hStep = 300 / (data.length - 1);
                var busLines = data.map(function (busLine, idx) {
                    var prevPt;
                    var points = [];
                    for (var i = 0; i < busLine.length; i += 2) {
                        var pt = [busLine[i], busLine[i + 1]];
                        if (i > 0) {
                            pt = [
                                prevPt[0] + pt[0],
                                prevPt[1] + pt[1]
                            ];
                        }
                        prevPt = pt;

                        points.push([pt[0] / 1e4, pt[1] / 1e4]);
                    }
                    return {
                        coords: points
                        // lineStyle: {
                        //     color: echarts.color.modifyHSL('#5A94DF', Math.round(hStep * idx))
                        // }
                    };
                });

                chart.setOption({
                    geo3D: {
                        map: '北京',
                        shading: 'realistic',

                        environment: '#111',

                        silent: true,

                        realisticMaterial: {
                            roughness: 0.8,
                            metalness: 0
                        },
                        postEffect: {
                            enable: true
                        },
                        groundPlane: {
                            show: true,
                            color: '#000'
                        },
                        light: {
                            main: {
                                intensity: 0,
                                shadow: true,
                                shadowQuality: 'high',
                                alpha: 30
                            },
                            ambient: {
                                intensity: 0.2
                            }
                        },
                        viewControl: {
                            distance: 50
                        },

                        itemStyle: {
                            color: '#333',
                            borderColor: '#fff'
                        },

                        regionHeight: 0.5
                    },
                    series: [{
                        type: 'lines3D',

                        coordinateSystem: 'geo3D',

                        effect: {
                            show: true,
                            constantSpeed: 2,
                            trailWidth: 2,
                            trailLength: 0.4,
                            // trailColor: [1, 1, 5],
                            trailOpacity: 0.5
                        },

                        blendMode: 'lighter',

                        polyline: true,

                        lineStyle: {
                            width: 0.1,
                            color: 'rgb(200, 80, 40)',
                            opacity: 0.
                        },

                        distanceToGeo3D: [0, 1],

                        data: busLines
                    }]
                });

                window.onresize = chart.resize;

                window.addEventListener('keydown', function () {
                    chart.dispatchAction({
                        type: 'lines3DToggleEffect',
                        seriesIndex: 0
                    });
                });
            });
        </script>
    </body>
</html>